JP2013031954A - Screen printing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing system that can efficiently perform screen printing relative to a large number of workpieces by eliminating a waste vacant time of a screen printer.SOLUTION: The screen printing system includes one screen printing part 19, and two workpiece conveyors 5, 6 which are installed to enable reciprocation between workpiece taking-in/sending-out positions 7, 8 and a printing area 4 of the screen printing part 19. Each of the workpiece conveyors 5, 6 performs an operation for taking in a workpiece W1 before screen printing from a carrying path 2 before printing and an operation for sending out a workpiece W2 after screen printing to a carrying path 3 after printing in a waiting state, and applies screen printing to the workpiece W1 before printing in an operating state.

Description

  The present invention relates to a screen printing system capable of efficiently performing screen printing on a large number of workpieces.

  A screen printer that performs screen printing on a workpiece is generally known. Patent Document 1 discloses a screen printer capable of efficiently executing screen printing.

JP 2011-20321 A

  However, the invention described in Patent Document 1 is an invention in which the phenomenon that the workpiece is dropped at the time of releasing the plate is prevented and the plate can be released smoothly so that screen printing can be executed efficiently. It is not intended that screen printing can be efficiently performed on a large number of workpieces by eliminating wasted time in the screen printing machine.

  Accordingly, the present invention has been made in view of the problems of the background art described above, and an object of the present invention is to perform screen printing on a large number of workpieces by eliminating wasted time of the screen printing machine. It is to provide a screen printing system that can be executed efficiently.

The invention according to claim 1 includes a pre-printing conveyance path 2 through which the workpiece W1 before screen printing is conveyed,
A screen printing system 1 provided between a post-printing conveyance path 3 through which a work W2 after screen printing is conveyed,
One screen printing unit 19 and two workpiece transfer machines 5 and 6 are provided.
Each of the workpiece transfer machines 5 and 6 is provided so as to be able to reciprocate between the workpiece take-in / send positions 7 and 8 and the printing area 4 of the screen printing unit 19,
Both the workpiece transfer machines 5 and 6 have a standby state and an operating state,
In the standby state, each of the workpiece transfer machines 5 and 6 takes an operation of taking the workpiece W1 before screen printing from the transfer path 2 before printing and the workpiece W2 after screen printing at the workpiece take-in / sending positions 7 and 8. The operation of sending to the transport path 3 after printing is performed, and in the operating state, the work is moved from the work take-in / send positions 7 and 8 to the printing area 4 to perform screen printing on the pre-printing work W1. It is controlled to return to the workpiece take-in / send positions 7 and 8.

  According to a second aspect of the present invention, in the first aspect of the present invention, when the first work transfer machine 5 is in a standby state, the second work transfer machine 6 is in an operating state, and the first work transfer machine 5 The second workpiece transfer device 6 is in a standby state when is in an operating state.

  According to a third aspect of the present invention, in the first aspect of the present invention, the timing at which the first work transporter 5 moves from the work take-in / send-out position 7 to the printing area 4 and the second work transport. The timing at which the machine 6 moves from the printing area 4 to the workpiece take-in / send position 8 is synchronized.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein one of the workpiece transfer machines 5 and 6 can be operated alone. And

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the work transporters 5 and 6 are provided with a rotatable rotating belt 24, and the work take-in / send-out When the rotary belt 24 rotates at the positions 7 and 8, the work W1 before screen printing is fed from the pre-printing conveyance path 2 to the conveyance path 3 after printing the work W2 after screen printing.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the rotating belt is formed of a resin such as a urethane resin and a silicon resin.

  According to the first aspect of the present invention, the two workpiece transfer machines 5 and 6 are provided around the single screen printing unit 19 that executes screen printing, and each of the workpiece transfer machines 5 and 6 operates in a standby state and operates. Therefore, it is possible to perform screen printing in the operation state and to prepare for the next operation state in the standby state, so that the screen printing can be smoothly performed for a large number of workpieces W1. And can be carried out efficiently.

  According to the second aspect of the invention, when the first work transfer machine 5 is in the operating state, the second work transfer machine 6 is in a standby state and can prepare for the next operation state. Screen printing can be performed efficiently without wasting time.

  According to the third aspect of the present invention, the timing at which the first work transfer device 5 moves forward from the work take-in / send-out positions 7 and 8 to the print area 4 and the second work transfer device 6 at the print area 4. Since the timing of returning to the workpiece take-out / sending positions 7 and 8 is synchronized, screen printing can be performed efficiently without wasting time.

  According to the fourth aspect of the present invention, even when one of the two workpiece transfer machines 5 and 6 breaks down, the remaining one workpiece transfer machine is effectively used to perform screen printing. Can be executed.

  According to the fifth aspect of the present invention, the pre-printing work W1 is taken onto the work transporters 5 and 6 and the post-printing work W2 is sent from the work transporters 5 and 6 by the rotation of the rotary belt 24. Can do. For this purpose, tentative means for taking the pre-printing work W1 onto the work transporters 5 and 6 and dedicated means for sending the post-printing work W2 from the work transporters 5 and 6 are provided. When provided individually, it is necessary to synchronize each other, and the entire apparatus becomes complicated. However, in the present invention, since only the rotating belt is provided, the entire apparatus can be simplified, thereby reducing the number of possible failure points as much as possible. Further, even if the workpieces W1 and W2 are damaged during the screen printing, the pieces of the workpieces W1 and W2 can be dropped by their own weight and easily removed by the rotation of the rotating belt 24. it can.

  According to the sixth aspect of the present invention, since the rotating belt 24 is formed of a resin such as urethane resin and silicon resin, the workpiece W1 is rotated by an appropriate friction of the resin such as urethane resin and silicon resin. It is possible to stay at an appropriate position without being displaced from an appropriate position on 24. Further, by forming the rotating belt 24 to have air permeability, the work W1 is sucked onto the rotating belt 24 by sucking air through the rotating belt 24 with the work W1 placed on the rotating belt 24. Therefore, it can be positioned on the rotating belt 2 with a more stable feeling without being displaced. Furthermore, by setting the thickness of the resin such as urethane resin and silicon resin to an appropriate thickness, the rotating belt 24 having an appropriate hardness can be formed. By setting the hardness of the rotating belt 24 to an appropriate level, excessive bending can be prevented even when the workpieces W1 and W2 are pressed with a squeegee or the like during screen printing. As a result, the workpieces W1 and W2 are prevented. Can be prevented from being damaged based on the excessive deflection.

FIG. 1 is a plan view of a screen printing system. FIG. 2 is a plan view for explaining the operation of the screen printing system. FIG. 3 is a plan view for explaining the operation of the screen printing system. FIG. 4 is a plan view in which a workpiece moving mechanism is added to FIG. FIG. 5 is a front view of the screen printing system. It is a front view of a workpiece conveyance machine. FIG. 7 is a side view of the rotating belt. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. FIG. 9 is a timing chart showing the operation of the work transfer machine. FIG. 10 is a timing chart showing the operation of the work transfer machine. FIG. 11 is a view similar to FIG. 1 showing a modification of the present invention.

1 to 3 are plan views of the entire screen printing system 1.
As shown in FIG. 1, the screen printing system 1 is disposed between a pre-printing conveyance path 2 and a post-printing conveyance path 3. The conveyance path 2 before printing conveys the workpiece W1 before screen printing to the screen printing system 1 by conveying the workpiece W1 in the direction of arrow A from upstream to downstream as indicated by a two-dot chain line in the figure. It is.

  Further, the post-printing conveyance path 3 receives the work W2 after screen printing from the screen printing system 1 and conveys it in the direction of arrow A from upstream to downstream as indicated by a two-dot chain line in the figure. It is.

  The screen printing system 1 includes one screen printing unit 19 (shown in FIG. 5) arranged in the printing area 4 located in the center of FIG. 1 and a first work provided upstream of the printing area 4. A conveyor 5 and a second workpiece conveyor 6 provided on the downstream side of the printing area 4 are provided.

  As shown in FIG. 5, the screen printing unit 19 is a device that is provided in the printing area 4 so as to be movable up and down, and that performs screen printing on the work W <b> 1. Each of the workpiece transfer machines 5 and 6 is provided so as to be able to reciprocate between the workpiece take-in / send positions 7 and 8 and the printing area 4. The distance from the work take-in / send position 7 to the print area 4 and the distance from the print area 4 to the work take-in / send position 8 are the same.

FIG. 1 shows a state in which both the work transfer machines 5 and 6 are stopped at the respective work take-in / feed-out positions 7 and 8. Here, as shown in FIG. 2 and FIG. 3, the work take-in / send positions 7 and 8 mean that the work transporters 5 and 6 receive the work W1 before screen printing from the transport path 2 before printing, and This is the position where the work W2 after screen printing is sent to the post-printing conveyance path 3.

  Each of the workpiece transfer machines 5 and 6 has a standby state and an operating state. FIG. 2 shows a case where the first workpiece transfer machine 5 is in a standby state and the second workpiece transfer machine 6 is in an operating state. FIG. 3 shows a case where the first workpiece transfer machine 5 is in an operating state and the second workpiece transfer machine 6 is in a standby state.

  When the workpiece transfer machines 5 and 6 are in the standby state, as shown in FIGS. 2 and 3, the workpiece transfer machines 5 and 6 take in the workpiece W1 before screen printing from the transfer path 2 before printing at the workpiece take-in / send positions 7 and 8, and Control is performed so that the work W2 after screen printing is sent to the post-printing conveyance path 3.

  In addition, the work transfer machines 5 and 6 move from the work take-in / send positions 7 and 8 to the printing area 4 (hereinafter referred to as forward movement) and perform screen printing on the pre-printing work W1. After that, it is controlled to execute an operation of returning to the workpiece take-in / sending positions 7 and 8 (hereinafter referred to as backward movement).

  The timing of the operations of the two workpiece transfer machines 5 and 6 and the screen printing unit 19 will be described later.

  Next, the workpiece moving mechanism 14 for moving the workpiece transfer machines 5 and 6 will be described. FIG. 4 is a plan view of the entire screen printing system 1, and is a diagram in which a work moving mechanism 14 for moving the work transfer machines 5 and 6 is added to FIG. As shown in FIG. 4, the work moving mechanism 14 for moving the first work transfer machine 5 includes a drive pulley 11 driven by an electric motor 10, a driven pulley 12, a drive pulley 11, and a driven pulley 12. A timing belt 13 is provided between the first work transfer machine 5 and the timing belt 13. By rotating the electric motor 10 of the workpiece moving mechanism 14 forward and backward, the first workpiece transfer machine 5 can reciprocate in the directions indicated by arrows B and C in the figure.

  In addition, a work moving mechanism 14 for moving the second work transfer machine 6 is spanned between a drive pulley 16 driven by an electric motor 15, a driven pulley 17, and the drive pulley 16 and the driven pulley 17. A timing bell 18 is provided, and the second workpiece transfer machine 6 is attached to the timing belt 18. By rotating the electric motor 15 of the workpiece moving mechanism 14 forward and backward, the second workpiece transfer device 6 can reciprocate in the directions indicated by arrows B and C in the figure.

FIG. 5 is a front view of the screen printing system 1 and shows a state in which FIG. 4 is viewed from the arrow D direction.
FIG. 6 shows an enlarged view of the second workpiece transfer machine 6 shown in FIG. 7 shows a view of FIG. 6 viewed from the direction of arrow E in FIG.

  As shown in FIG. 6, the second workpiece transfer machine 6 includes a lower table 20, an upper table 21, and a workpiece provided on the upper table 21 and on which workpieces W1, W2 are placed as shown in FIG. The mounting table 26, the driving pulley 22 and the driven pulley 23 that are rotatably supported by the upper table 21, and the rotating belt 24 that spans the driving pulley 22 and the driven pulley 23 so as to surround the work mounting table 26. And a tension pulley 25.

  The rotating belt 24 can be molded to an appropriate thickness using, for example, a resin such as a urethane resin and a silicon resin. Since the rotating belt 24 is formed of a resin such as urethane resin and silicon resin, the workpiece W1 is displaced from an appropriate position on the rotating belt 24 by appropriate friction of the resin such as urethane resin and silicon resin. Can stay in place. Further, by forming the rotating belt 24 so as to have air permeability, when the work W1 is placed on the rotating belt 24 and sucked through the rotating belt 24, the work W1 is adsorbed on the rotating belt 24. Positioning on the rotating belt 24 can be performed more stably without any displacement. Further, when the rotating belt 24 is molded in an appropriate thickness with a resin such as urethane resin and silicon resin, the rotating belt 24 has an appropriate hardness, and thus screen printing is performed. Even if the workpiece W1 is subjected to a pressing force by a squeegee or the like during this time, the workpiece W1 is supported by the rotating belt 24 and is not excessively bent and is not damaged.

  An alignment mechanism 27 is provided between the lower table 20 and the upper table 21. The alignment mechanism 27 is a mechanism that adjusts the position of the upper table 21 by moving the upper table 21 relative to the lower table 20 on a horizontal plane. Details of the alignment mechanism will be described later.

  As shown in FIG. 7, a work take-in unit 28 is provided on the upstream side of the rotating belt 24 of the work transfer machines 5 and 6, and the work take-in unit 28 is a work W <b> 1 that has been transported through the pre-printing transport path 2. Is fed to the rotating belt 24. The workpiece take-in portion 28 can be constituted by, for example, a belt that is rotatably provided.

  Further, a work delivery unit 29 is provided on the downstream side of the rotary belt 24 of the work transporters 5 and 6, and the work delivery unit 29 receives the printed work W <b> 2 from the rotary belt 24, and the post-printing transport path 3. To be sent to. This work sending part 29 can be constituted by a belt provided rotatably, for example.

  Next, an alignment mechanism 27 provided between the lower table 20 and the upper table 21 of the workpiece transfer machines 5 and 6 will be described with reference to FIGS. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. In FIG. 8, MX1 and MX2 indicate electric motors constituted by, for example, stepping motors. The electric motors MX1 and MX2 are fixed to the lower table 20. A nut portion 31 is provided in the middle of the screw shaft 30 of the electric motors MX1 and MX2, and the screw shaft 30 is rotatably supported by a bearing 32. The bearing 32 is fixed to the lower table 20. The screw shaft 30 is provided in the X direction.

  The nut portion 31 is provided with a linear motion guide (LM guide) LX. The LM guide LX includes a rail 33 and a slider 34, and the slider 34 is fixed to the upper table 21, as shown in FIG.

  An electric motor MY composed of, for example, a stepping motor is fixed to the lower table 20. A nut portion 31 is provided in the middle of the screw shaft 30 of the electric motor MY, and the screw shaft 30 is rotatably supported by a bearing 32. The bearing 32 is fixed to the lower table 20. The screw shaft 30 is provided in the Y direction.

  The nut portion 31 is provided with a linear motion guide (LM guide) LY. The LM guide LY includes a rail 33 and a slider 34, and the slider 34 is fixed to the upper table 21 as shown in FIG.

  In the positioning mechanism 27 configured as described above, if the upper table 21 is to be moved in the direction indicated by the arrow X in FIG. 8, the electric motors MX1 and MX2 are rotated forward while the electric motor MY is moved. Stop. By forward rotation of the electric motors MX1 and MX2, the screw shaft 30 rotates forward and the nut portion 31 moves in the arrow X direction. Since the slider 34 of the LM guide LX is fixed to the upper table 21, the upper table 21 moves in the arrow X direction. At this time, since the upper table 21 is fixed to the slider 34 of the electric motor MY, it moves in the direction indicated by the arrow X so as to be guided by the LM guide LY of the electric motor MY.

  On the other hand, when the upper table 21 is to be moved in the opposite direction, the electric motors MX1 and MX2 are reversed.

  Further, when the upper table 21 is moved in the direction indicated by the arrow Y in FIG. 8, the electric motor MY is normally rotated while the electric motors MX1 and MX2 are stopped. By forward rotation of the electric MY, the screw shaft 30 rotates forward and the nut portion 31 moves in the direction indicated by the arrow Y. Since the slider 34 of the LM guide LY is fixed to the upper table 21, the upper table 21 moves in the arrow Y direction. At this time, since the upper table 21 is fixed to the slider 34 of the electric motors MX1 and MX2, the upper table 21 moves in the arrow Y direction so as to be guided by the LM guide LX of the electric motors MX1 and MX2.

  On the other hand, when the upper table 21 is to be moved in the opposite direction, the electric motor MY is reversed.

  Since the workpieces W1 and W2 are placed on the upper table 21, as shown in FIG. 6, the position of the workpieces W1 and W2 is finely adjusted to a preferred position by adjusting the position of the upper table 21. Can do.

  In the above description, the configuration in which the upper table 21 is finely adjusted in the XY direction with respect to the lower table 20 has been described. However, the angle is determined by rotating the upper table 21 with respect to the lower table 20 using known means. It is also possible to adjust. In this case, for example, by providing a minute clearance between the rails 33 of the LM guides LX and LY and the slider 34, the angle can be adjusted by rotating the upper table 21 relative to the lower table 20. Since the fine adjustment mechanism is not the gist of the present invention, further explanation is omitted.

  Then, the workpiece alignment mechanism 27 visually recognizes the position of the workpiece W1 on the workpiece transfer machines 5 and 6 with a television camera, for example, and when the position of the workpiece W1 is displaced from an appropriate position, By driving the aligning mechanism 27 and displacing the upper table 21 with respect to the lower table 20, the position of the workpiece W1 can be corrected to an appropriate position.

  The first workpiece transfer machine 5 has the same configuration as that of the second workpiece transfer machine 6 described above, and a description thereof will be omitted.

  FIG. 9 is a timing chart showing control of the work transfer machines 5 and 6. First, in a section from 0 to T1, the work transfer device 6 on which the pre-printing work W1 is placed moves forward from the work take-in / sending position 8 to the printing area 4, and the post-printing work W2 is placed. The workpiece transfer machine 5 is moved back from the print area to the workpiece take-in / send position. This state is shown in FIG.

  In FIG. 9, screen printing is performed on the work W <b> 1 placed on the work transfer machine 6 in the sections T <b> 1 to T <b> 2. At this time, the work transporter 5 is in a standby state at the work take-in / send position 7, and sends the work W2 after screen printing to the post-printing transport path 3, and also transfers the work W1 before screen printing to the transport path before printing. Take in from 2. This state is shown in FIG.

  Next, in the sections T2 to T3 in FIG. 9, the work transporter 6 moves backward from the printing area 4 to the work take-in / send position 8, and at the same time, the work transporter 5 places the pre-printing work W1. The print area 4 moves forward from the workpiece take-in / send position 7. This state is shown in FIG.

  In the section T3 to T4 in FIG. 9, screen printing is executed on the work W1 placed on the work transfer machine 5. At this time, the work transporter 6 is in a standby state at the work take-in / send position 8 and sends the work W2 after screen printing to the post-printing transport path 3 and also transfers the work W1 before screen printing to the transport path before printing. Take in from 2. This state is shown in FIG. 3 as described above.

  As described above, in the control shown in FIG. 9, the forward movement and the backward movement are performed at the same time so that the first workpiece transfer machine 5 moves backward when the second work transfer machine 6 moves backward. However, in the control shown in FIG. 10, when the second workpiece transfer device 6 is in the operating state, both the workpiece transfer devices 5 and 6 are simultaneously operated so that the first workpiece transfer device 5 is in the standby state. It is characterized in that it does not become a mutual state or a standby state.

  Next, the operation will be described. As shown in FIG. 2, it is assumed that the pre-printing work W <b> 1 is conveyed from the upstream pre-printing conveyance path 2 toward the downstream side, and the pre-printing work W <b> 1 is taken into the second work conveyance machine 6.

  Then, as shown in FIG. 2, the second workpiece transfer device 6 is in an operating state, moves forward from the workpiece take-in / send position 8 toward the printing area 4, and executes screen printing in the printing area 4. . At this time, the first workpiece transfer machine 5 is in a standby state, takes in the workpiece W1 before printing from the conveyance path 2 before printing, and sends the workpiece W2 after printing to the printing conveyance path 3.

  Then, as shown in FIG. 3, the first work transporter 5 is moved simultaneously with or after the second work transporter 6 moves backward from the printing area 4 to the work take-in / send position 8. In the operating state, the workpiece moves forward from the workpiece take-in / send position 7 toward the printing area 4, and screen printing is performed on the pre-printing workpiece W1. Thereafter, these operations are repeated.

  By the way, when screen printing is performed on the workpiece W1, a squeegee or the like is pressed against the workpiece W1, and the workpiece W1 is easily damaged by the pressing force at that time. However, in the present invention, since the rotary belt 24 on which the pre-printing work W1 is placed is formed of urethane resin and has an appropriate hardness, the work W1 is excessive even if it receives a pressing force. No bending and no risk of breakage.

  Further, even if the work W1 is damaged, the rotating work 24 on which the damaged work W2 is placed rotates as shown in FIG. Therefore, there is no hindrance when taking the next new pre-printing work W1 onto the rotating belt 24. In addition, as described above, the rotating belt 24 is formed of a resin such as urethane resin and silicon resin and has an appropriate friction. Therefore, even if the workpiece transfer machines 5 and 6 reciprocate, W1 can remain at the initial position on the rotating belt, and there is no fear of displacement. Further, by forming the rotating belt 24 so as to have air permeability, the work W1 is attracted to the rotating belt 2 by being sucked through the rotating belt 24 while the work W1 is placed on the rotating belt 2. It can be positioned on the rotary belt 2 with a more stable feeling without shifting.

  According to the present invention, as described above, two work transfer machines 5 and 6 are provided for one screen printing unit 19, and each work transfer machine 5 and 6 is in a standby state in addition to an operating state. Since a state is provided and preparations for the next operating state can be made in the standby state, efficient and efficient screen printing can be executed by the cooperation of the two workpiece transfer machines 5 and 6. .

  Further, according to the present invention, since the two work transfer machines 5 and 6 are provided for one screen printing unit 19, even if one work transfer machine 5 and 6 breaks down. The other workpiece transfer machines 5 and 6 can be operated to perform screen printing.

  In the above embodiment, the workpiece W1 before printing is taken into the workpiece conveyors 5 and 6 by the rotating belt 24 provided in the workpiece conveyors 5 and 6, and the workpiece W2 after printing is transferred to the workpiece conveyor 5. 6, without using the rotating belt 24, for example, the pre-printing work W <b> 1 in the pre-printing conveyance path 2 is pushed into the work conveyance machines 5, 6 with a stick or the like, and the work conveyance machine 5, 6 is used. It is also possible to adopt a configuration in which the post-printing work W2 on 6 is pushed out to the post-printing conveyance path 3 with a stick or the like.

  Alternatively, the pre-printing work W1 and the post-printing work W2 positioned on the work transporters 5 and 6 are lifted by suction or the like while the pre-printing work W1 positioned on the pre-printing transport path 2 is picked up. It is also possible to move the post-printing work W2 to the post-printing conveyance path 3.

  FIG. 11 shows a modification of the present invention. Although FIG. 1 demonstrated the case where the workpiece conveyance machine 5, the printing area 4, and the workpiece conveyance machine 6 were arrange | positioned with respect to the front position in the left-right direction, FIG. The case where the conveyance machine 5, the printing area 4, and the workpiece conveyance machine 6 are arranged is shown. Even if the work transfer machine 5, the printing area 4, and the work transfer machine 6 are arranged as shown in FIG. 11, the same effects as those shown in FIG.

  The present invention can be effectively used when efficiently performing screen printing on a large number of workpieces.

DESCRIPTION OF SYMBOLS 1 Screen printing system 2 Pre-printing conveyance path 3 Post-printing conveyance path 4 Printing area 5 Work conveyance machine 6 Work conveyance machine 7 Work take-in / out position 8 Work take-in / out position 19 Screen printing unit 24 Rotating belt

Claims (6)

A pre-printing conveyance path through which the work before screen printing is conveyed;
A screen printing system provided between a post-printing conveyance path through which a work after screen printing is conveyed,
One screen printing section and two work transfer machines
Each workpiece transfer machine is provided so as to be capable of reciprocating between a workpiece take-in / send position and a printing area of a screen printing unit,
Both the workpiece transfer machines have a standby state and an operating state,
Each of the workpiece transfer machines, in a standby state, at the workpiece take-in / send-out position, an operation of taking a workpiece before screen printing from the transfer path before printing, and an operation of sending a workpiece after screen printing to the transfer path after printing And in an operating state, control is performed so as to move from the workpiece take-in / send position to the print area, perform screen printing on the work, and then return to the work take-in / send position. Screen printing system.   The second work transporter is in an operating state when the first work transporter is in a standby state, and the second work transporter is in a standby state when the first work transporter is in an operating state. The screen printing system according to claim 1.   The timing at which the first workpiece transfer machine moves from the workpiece take-in / send position to the printing area is synchronized with the timing at which the second workpiece transfer machine moves from the print area to the workpiece take-out / send position. The screen printing system according to claim 1.   The screen printing system according to any one of claims 1 to 3, wherein one of the two workpiece transfer machines can be operated alone.   The work transporter is provided with a rotatable rotating belt, and the work before screen printing is simultaneously taken in from the pre-printing transport path by rotating the rotating belt at the work take-in / sending position. The screen printing system according to claim 1, wherein the screen printing system is sent out to the post-printing conveyance path. The screen printing system according to claim 5, wherein the rotating belt is formed of a resin such as a urethane resin and a silicone resin.

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